4The principal section shall not prevent the making of an adoption order or provisional adoption order under the [1958 c. 5 (7 & 8 Elliz. 2).] Adoption Act 1958 in respect of a person who has attained the age of eighteen if the application for the order was made before the commencement date, and in relation to any such case that Act shall have effect as if the principal section had not been enacted.